#### Answer

$A$

#### Work Step by Step

Both the sine and cosine functions are defined for any real number $x$.
Thus, the domain of both the sine and cosine functions is:
$(-\infty, +\infty)$.

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Published by
Pearson

ISBN 10:
978-0-13-421743-7

ISBN 13:
978-0-13421-743-7

$A$

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